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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
finished cgs vco
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arnoid



Joined: Aug 23, 2009
Posts: 55
Location: Belgium

PostPosted: Thu Oct 29, 2009 7:03 am    Post subject: finished cgs vco
Subject description: no pulse output of the suboscillator
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Hi i'm new on this forum and also a beginning diy'er Smile

I'm busy building a cgs vco with al the options (suboscillator, waveshaper,...).
I finished it and everything seems to work exept the pulse output of the suboscillator I get no output , If I look with my scope and turn the S TRIM fully CW I see the beginning of a pulse waveform.
It's like the trimmer's range is not big enough, I'm using a 22K trimpot.
Somebody knows what the problem could be ?

I also noticed that the outputs of the waveshapers saw to sine AC & DC are less louder then the outputs of the waveforms of the oscillator.
Is this normal ? the diffirence in volume is quiet big...
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andrewF



Joined: Dec 29, 2006
Posts: 1174
Location: australia
Audio files: 4

PostPosted: Thu Oct 29, 2009 9:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi
do you have the SQ output connected to the STI input?
if you are using jacks you can wire the switches of the jacks together or just patchcord, if banana sockets use a patchcord.
Also at some pot settings the sub-osc has no output.

re: sine outputs, does adjusting WS trim help at all?

and seeing all these problems involve the LM3900, have a good check it is getting proper voltages, grounded, etc.
Usually best to suspect the chip after exhausting other possibilties.

have fun Very Happy
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arnoid



Joined: Aug 23, 2009
Posts: 55
Location: Belgium

PostPosted: Fri Oct 30, 2009 2:01 am    Post subject: Reply with quote  Mark this post and the followings unread

thx for you fast answer Smile

No I didn't wire the SQ output to the STI in (is this nesseccary to have a pulse output at the suboscillator ? ) I'm working with banana's so a patchcord is fine then...

I also mailed ken stone about the waveshape outputs he says it's normal that they are less louder then the waveform outputs of the oscillator..
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andrewF



Joined: Dec 29, 2006
Posts: 1174
Location: australia
Audio files: 4

PostPosted: Fri Oct 30, 2009 5:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

arnoid wrote:


No I didn't wire the SQ output to the STI in (is this nesseccary to have a pulse output at the suboscillator ? ) I'm working with banana's so a patchcord is fine then...
.


The subosc STI input is not connected on the PCB so, yes, you need to patch a signal in there. Of course you can patch in other modules rather than the VCO SQ out, lots of room for experimenting.
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zthee



Joined: Feb 20, 2008
Posts: 413
Location: Stockholm

PostPosted: Wed Dec 30, 2009 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

I find the output of the sub oscillator to be very narrow - anyone else experiencing this?
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arnoid



Joined: Aug 23, 2009
Posts: 55
Location: Belgium

PostPosted: Thu Jan 21, 2010 4:47 am    Post subject: Reply with quote  Mark this post and the followings unread

zthee wrote:
I find the output of the sub oscillator to be very narrow - anyone else experiencing this?


Yes I have 2 cgs vco with al the options on the panel I also find the pulse output of the suboscillator verry narrow and quiet...
I also noticed the staircase output is alot louder then the pulse output if you connect a square from the vco core to it...

I only use the staircase output to modulate the waveshaper from the suboscillator, the pulse output is rather useless.
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